L.A. Bloomfield

Saturation spectroscopy of ultraviolet transitions in mercury with a frequency-doubled cw ring dye laser☆

Abstract Doppler-free saturated absorption spectroscopy has been used to study the ultraviolet HgI transitions 6 3 P 0 -6 3 D 1 at 296.73 nm and 6 3 P 0 -6 1 D 2 at 296.76 nm. The required tunable ultraviolet radiation was produced by a ring cavity cw dye laser with intracavity ADA frequency doubler. The isotope shifts of the 6 3 P 0 -6 3 D 1 line for naturally abundant mercury have been measured to within a few MHz.

Generation of continuous-wave ultraviolet radiation by sum-frequency mixing in an external ring cavity

We have generated several milliwatts of single-frequency cw UV radiation near 265 nm by mixing the outputs of a rhodamine 6G ring dye laser and a 488-nm argon-ion laser in a crystal of ammonium dihydrogen phosphate. The dye-laser intensity inside the crystal was enhanced by a frequency-locked passive ring cavity, yielding at least a tenfold improvement in UV power over earlier mixing schemes. An envisioned extension to wavelengths near 243 nm is of particular interest for high-resolution two-photon spectroscopy of atomic hydrogen.

Nonlinear UV-laser spectroscopy of the 2 3S-5 3P transition in 3He and 4He

Abstract We report the production of stable CW single mode UV radiation around 295 nm at powers exceeding 50 mW, using a passive enhancement cavity for second harmonic generation. With this laser we have investigated the 2 3 S−5 3 P transition at 294.5 nm in 3 He and 4 He by intermodulated fluorescence spectroscopy. The measurements of the hyperfine splittings of the 5 3 P levels agree with semi-empirical calculations.

CW ultraviolet saturation spectroscopy of the 6p 3P0-9s 3S1 transition in mercury at 246.5 nm

Abstract We have measured the even isotope structure of the 6p 3 P 0 -9s 3 S 1 transition in mercury at 246.5 nm using saturated absorption spectroscopy with radiation produced as the sum frequency of a 363.8 nm argon ion laser and an LD700 ring dye laser in ADP. This is the first use of cw sum-frequency mixing in nonlinear laser spectroscopy in the ultraviolet. No previous cw Doppler-free measurements have been reported at wavelenghts below 294.5 nm

Singlet-triplet mixing in ns(n=12-14) Rydberg states of 3He

The hyperfine structure of the n3S (n=12-14) Rydberg levels in 3He have been studied by ultraviolet-infrared double-resonance laser spectroscopy. Using the frequency-doubled output of a CW ring dye laser the authors have populated the 1s5p 3P state of 3He by excitation from the metastable 1s2s 3S state at 294.5 nm. In a second step, an infrared single-mode colour-centre laser is used to excite s Rydberg levels. The experimental results for the hyperfine splittings can only be explained with calculations which include singlet-triplet mixing.